Tourmaline and Staurolite Optical Properties

Tourmaline

Staurolite

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1 Optical Properties

1.1 Luster

Vitreous

Resinous

1.2 Pleochroism

typically moderate to strong

X = colorless; Y = pale yellow; Z = golden yellow

1.5 Dispersion

0.02NA

0.007 1

1.7 Transparency

Transparent, Translucent, Transparent to opaque

Blue Chart Gem Identification (2010) More from other references

1.8 Refractive Index

1.614-1.6661.736-1.762

1 3.25

1.9 Optic Character

Not Available

1.10 Crystal System

Trigonal

monoclinic

1.11 Birefringence

0.014-0.0400.009-0.015

0 0.296

1.12 Clarity

Transparent

Blue Chart Gem Identification (2010) More from other references

Tourmaline and Staurolite Optic Character

Tourmaline and Staurolite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Tourmaline and Staurolite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Tourmaline and Staurolite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

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Tourmaline and Staurolite Transparency

Similar to their colors, Tourmaline and Staurolite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Tourmaline is Translucent, Transparent and Transparent to opaque while Tourmaline is Translucent, Transparent and Transparent to opaque in appearance.